(Table 68, contd)
Troubleshooting Test Steps
Values Results
11. High-Pressure Fuel Pump
A. Check the timing of the high-pressure fuel pump. Refer to
Systems Operation, Testing, and Adjusting, “Fuel Injection Tim-
ing - Check”.
HP fuel pump Result: The timing of the high-pressure fuel pump is
incorrect.
Repair: Correct the timing of the high-pressure fuel pump.
Refer to Disassembly and Assembly, “Fuel Injection Pump -
Remove” and Disassembly and Assembly, “Fuel Injection
Pump - Install”.
With the high-pressure fuel pump correctly timed, check
that the engine starts normally.
If the engine will not start, proceed to Test Step 12.
Result: The timing of the high-pressure fuel pump is
correct.
Repair: Replace the high-pressure fuel pump. Refer to Dis-
assembly and Assembly, “Fuel Injection Pump - Remove”
and Disassembly and Assembly, “Fuel Injection Pump -
Install”.
Check that the engine starts normally.
If the engine will not start, proceed to Test Step 12.
12. Starting Aids
A. Check the operation of the glow plugs. Refer to Trouble-
shooting, “Glow Plug Starting Aid - Test”.
B. Check the operation of the ether starting aid. Refer to Trou-
bleshooting, “Ether Starting Aid - Test”.
Glow plugs Result: One or more of the glow plugs are faulty.
Repair: Replace any faulty glow plugs. Refer to Disassem-
bly and Assembly, “Glow Plug - Remove and Install”.
Check that the engine starts normally.
If the engine will not start, proceed to Test Step 13.
Result: The ether starting aid is faulty.
Repair: Diagnose the ether system. Refer to Troubleshoot-
ing, “Ether Starting Aid - Test”.
Check that the engine starts normally.
If the engine will not start, proceed to Test Step 13.
13. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation,
Testing, and Adjusting, “Compression - Test ”.
Cylinder
compression
Result: The results of the compression test are outside the
specifications.
Repair: Investigate the cause and rectify any faults.
Note: Possible causes of low compression are shown in
the following list:
· Loose glow plugs
· Faulty piston
· Faulty piston rings
· Worn cylinder bores
· Worn valves
· Faulty cylinder head gasket
(continued)
UENR4469-36 139
Symptom Troubleshooting
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